Flooding Rains North & West of Portland Metro Area

10:30am Friday…

An “atmospheric river” is pounding extreme NW Oregon and SW Washington with enormous rain totals this morning.  Look at those I-5 cities to the north of Castle Rock to Olympia; closing in on 4-5″ of rain.  And 7-8″ rain so far in the Willapa Hills.  These are rain totals since about midnight YESTERDAY


Meanwhile models have done well showing a a sharp southern edge to the precipitation; it’s rainy in west and north metro, but dry south and east.

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The warm southerly wind has pushed Portland to 59 degrees so far this morning, tying a record set on this date in 2014.  I see ski resorts are wet and mild as expected; although luckily Mt. Hood isn’t getting any sort of soaking rain with the precipitation staying up north.  This continues through this evening before a changeover to snow tomorrow and Sunday on the mountain.

Other than a few spots of high water the next 24 hours in the metro area (intersections, low spots etc…) I don’t expect any significant weather issues here.  It’s all about the north coastline and up into SW Washington.  Actually Columbia County is getting plenty of rain as well.

I’ll be back at work Sunday

Chief Meteorologist Mark Nelsen

20 Responses to Flooding Rains North & West of Portland Metro Area

  1. Andrew says:

    Interesting. Is that a recent development? GFS dropped some colder air into region at very end of run but so far out I can’t really take seriously.

    • rmlounsbury says:

      The GFS has been hinting at colder air for the last week or so (a long with a wetter pattern). This is the first run that went as cold as the 12Z did.

      If you look at the ensembles it seems to be the outlier but it does seem colder air is probably in our future in the next couple weeks.

  2. JohnD says:

    Lots of cold air bottled up in interior Alaska now at least. -33’ in Fairbanks. No doubt a piece of that energy will migrate eventually. When and where a mystery!

  3. Joshua Lake Oswego says:

    December will end up below normal for precipitation and way above average for temperature. The next 10-15 days look BOR ING. No hint at anything to even wishcast for.

    • Roland Derksen says:

      Looks like my precipitation amount will be about average, but just to the east of us, it’ll be way above. Anyway, the sun is finally shining here today, that’s the important thing!

  4. Joshua Lake Oswego says:

    Seattle: 3.01” today
    Portland: .24” today

    • Joshua Lake Oswego says:

      Seattle: 5.54” total event so far
      Portland: 1.78” total event so far

      Apology accepted, W7.

  5. OLIVER WATSON says:

    Don’t look at Pete parsons seasonal forecast. It’ll make you cry

    • JohnD says:

      Yep. A no winter winter if his analogs are correct. We can only hope that “Mother Nature will provide some surprises!

    • Mr Realist says:

      Best read ever!!!! Perfect winter conditions 😎😎😎

    • Andrew says:

      yeah the concerning thing for me is there doesn’t appear to be much cold air around to even tap into right now without a fairly major pattern change, which isn’t looking likely over next couple weeks. Very little to be even remotely excited about looking at current models. At least it’s only late December and there are still several weeks for things to shift. If it were mid to late January I’d be starting to think about sun and spring.

  6. Jake in Gresham says:

    A very non-event here. The night before I was at half an inch and the next morning I was over an inch of rain. Haven’t gotten anything since.

    Hopefully this is the start of more Winter weather to come because tomorrow is the “first day” of Winter.

  7. WEATHERDAN says:

    Peace to all and a Merry Christmas too. Think good thoughts about cold and snow.

  8. Jason Hougak says:

    I bet Detroit Lake would have loved to get in on the action, it looks 60’ drawndown.

  9. Roland Derksen says:

    We’ve gotten off pretty easy here: 1.24 inches yesterday, and that ended by 7pm- Afterwards about a 4 hour break before precipitation resumed with a lighter intensity. Quite a heavy snowfall east of us in the mountains; reports of up to or over 2 feet in depth, highways are closed or at least kept barely open. Meanwhile, i want some sunshine; This gloomy weather is getting to me!

  10. Rivergrove says:

    At least all wind driven rain is sort of cleaning our windows – and the air smells wonderfully fresh!

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